Mining drill



April 18, 1933. L, FELLAY 1,904,657

MINING DRILL Filed Feb. 12. 1932 Jawa c/// Patentecl Apr. 18, 1933UNITED STATES PATENT orriclar- LUIS J. FELLAY, OF PEORIA, ILLINOIS,ASSIGNOR TO DOOLEY BROTHER-S, OF PEORIA,

\ ILLINOIS, A CORPORATION OF ILLINOIS MINING DRILL Application filedFebruary 12, 1932. Serial No. 592,472.

My invention relates more particularly to electrically driven miningdrills of the type shown in the application of Edward J. Dooley, SerialNo. 281,04L9, filed May 28, 19 28.

One object of my invention is the provision of driving Connectionswhereby the thread bar may be continually rotated in one direction, andwhile being so rotated may be fed forward to drill, the forward feedstopped to finish the bottom of a hole, or fed backward to remove thedrill from the hole.

;An other object of my invention is the prorision. of a simple yeteffective controlling dovicc for the various feeds of the thread bar.

Other objects of my invention will appear and be described in theSpecification.

The norelty of my invention will be hereinafter more fully set forth andspecifically pointed out. in' the claim.

In the accompanying drawing:

Fig. 1 is a Central sectional elevation of that portion of a miningdrill embodying my invention.

Fig. 2 is a detail of a portion of the control device.

Fig. 3 is a detail of the clutch for holding the thread bar nut againstrotation.

Fig. 4 is an end View of the sleeve which rotates the thread bar.

The same numerais of reference are used to indicate identical parts inthe various figures.

As showing one form of device embodying my invention, though withoutlimiting myself to the details of construction shown and to be hereindescribed, but availing myself of all changes and modifications whichmay be made within the Scope of the appended claim, reference is made tothe accompanying drawing and to Fig. 1 of the drawing of the applicationabove.

By referring to Fig. 1 of the drawing of application Serial No. 281,O49, it will be seen that the complete drill comprises a post on whicha slide is mounted, the slide comprising in part a turn table upon whichthe drilling mechanism itself is mounted and for convenience, in thepresent application, I will number the parts thereof to correspond withsimilar parts shown in the above mentioned 50 application.

The drilling mechanism itself comprises a main frame 4, Only a portionof which is, shown in the present application, the electric motor 5being represented in the present case by its forward or driving end Thegear housing is shown at 7 and through this as well as the main frame 4,the thread bar 8 extends; the latter Carrying any suitable drill uponits end toward the left of Fig. 1 of the present drawing.

The armature shaft of the motor carries a gear, not shown, which,through an intermediate reduction gear, (not shown), drives the gear 9carried on the shaftlO, the latter Carrying the main driving pinion 11.The shaft 10 is splined as at 12 and carries the dental clutch 13 'whichis adapted to engage the corresponding clutch j aws on the face of thegear 14 which is carried by the clutch drum 15, the latter being mountedfree to turnon the quill 16. The shaft 10 is preferably mounted onanti-friction bea rings17 and18 and is provided with a washer 19 lyingagainst the ends of the splines 12 and overlapping the hub of the drum15 to prevent endwise movement thereof on the quill 16.

The pinion 11 meshes with and drives -a gear 20 fixed upon the drivingsleeve 21, the latter bein interiorly provided with a pair of featherTeys 22 which engage corresponding key-ways longitudinally formed in thethread bar 8 so that as the sleeve 21 is rotated, the thread bar 8 iscorrespondingly rotated, though it is free to slide longitudinallythrough the 'sleeve in either direction. p

The sleeve 21 is mounted in anti-frict-ion bearing28, within the housing7 andbearing 24 carried in bearing carrier 25, the thrust, bearing 26being provided to reduce the friction during the time the drill is beingfed to its work.

The bearing Carrier 25 also carres a quill 27 which forms a pilotbearing for the pinion 28 which meshes with the gear 14, and iscarriedby sleeve 29, the latter having its bearing in the housing 7 andprojecting through the latter and Carrying the nut 30 which engages thethreads of the thread bar 8.

A two direction thrust bearing 31 :is provided for the nut 30, thrust'inthe -feeding 100 direction being taken by the collar of the nut 30 incontact With the thrust bearing 31 on one side, While the other side ofthis bearing rests against the housing 7 thrust in the oppositedirection being taken through the bushing 32 Which bears at one endagainst a collar on the sleeve 29, its other end coming in contact Withthe bea-ring 31, the other side of Which rests against the shoulder 33in the nose piece 34 carried by the housing 7.

A clutch band 35 is mounted Within the drum and is held central therein,When released, by ribs 36 Which come in contact With a portion of themounting for the bearing 18. The band 35 is brought into contact Withthe drum 15 by the eXpander 37, the latter being provided With mutilatedgear 38 Which is engaged by a corresponding mutilated gear 39 carried bythe Operating shaft 40, the latter being provided With any suitable handlever 41 vvhereby the shaft may be rocked as required.

The mutilated gear 39 is partly formed as a cam 42 (see Fig. 2) and ashifter rod 43 bears against this cam, being held in contact thereWithby the compression spring 44 Which is provided With a screvv plug 45 toform' an abutment. The shifter rod 43 carries a fork 46 Which engagesthe dental clutch 13, and by means of Which the latter is moved when theshifter rod 43 is moved. i

The operation of the device is as follows, assuming that the shaft 10 isbeing constantly rotated and that it is desired to' feed the thread barto the left Which is the direction of its motion during the drillingoperation. By moving the handle of the lever 41 to the left,themutilated gears 38 and 39 are brought into engagement to rotate theexpander 37 and so engage the band 35 With the drum 15 and hold the gear14 against rotation. This of course stops any rotation of the sleeve 29and the nut 30 and the thread of the thread bar, While the latterrotates Within the nut 30, advances the thread' bar to the left.

When it is desired to stop the feed of the thread bar, the lever 41 ismoved to the neutral position, releasing the band35 and per- 56 mittingthe drum 15, and its gear 14 to be rotated by the gear 28 as the threadbar 8 rotates the nut 30, under Which conditions the nut 30 and thethread bar turn in the same direction at the same rate.

When it is desired to feed the thread bar to the right, the handle ofthe lever 41 is moved to the right thereby moving the cam 42 from underthe end of the shifter rod 43 and permitting the spring 44 to cause theengagement of the dental clutch 13 With the jaWs on the gear 14 and sodrive this gear in the same direction and at the same speed as the shaft10.' It is to be observed that the gear 14 is of, considerably largerdiameter than the driving pinion 11 so that its surface speed is greaterthan that of the pinion 11 bar 8, the result being that the nut 30 Overruns the threads of the thread bar and moves it to the right.

The result of this arrangement is that the .drill itself s WithdraWnfrom the hole being drilled While it is rotating in the same directionas it rotated during the drilling operation thereby clearing out thechips from the hole end leaving the latter in condition to receive thecharge of blasting poWder or other material Which the hole Was drilledto receive.

The nut 30 may be a simple device such as shown or it may be composed ofa .two-part holder Carrying' interiorly threaded liners such as areordinarily used on mining drills and are known to the trade.

Having thus fully described my invention, I claim: 4

In a mining drill, the combination of a housing, a threaded tooloperatively arranged in said housing for longitudinal movement in onedirection through the housing and for reractible movement in theopposite direction through said housing, a driving means,

a train of gearing including clutch means adapted to be actuated by saiddriving means for imparting rotative and reciprocal movement to saidtool, a controllable means for such Clutch means, said controllablemeans including a manually movable member, movable into selectivepositions Whereby the clutch maybe alternatively actuated to impartreciprocal movement to said tool When such member is in one position, inanother position to'retain the tool neutral and rotative and in anotherposition to impart to the tool reciprocal movement in the oppositedirection.

LOUIS J. FELLAY.

